/Engine/Plugins/Editor/UVEditor/Source/UVEditorTools/Public/Selection/UVToolSelectionHighlightMechanic.h
Set the transform of the unwrap mesh highlights without rebuilding them, likely to follow the translation of the underlying elements via gizmo.
void SetUnwrapHighlightTransform ( const FTransform & Transform, bool bRebuildStaticPairedEdges, bool bUsePreviews )